I said 'should' in post 7 because some A/G operators aren't as informative as they could be.
Example: friend of mine flying a Kingair in the south east of England heading for France; as he approaches a notified parchute site situated on a licenced airfield with A/G service, he calls for traffic info even though he will pass overhead the ATZ. When he finally gets a reply after several calls, he's told 'no known traffic'. But as he's been on frequency for several minutes, he's aware that there is a parachuting aircraft airborne having heard him also calling the A/G frequency. My friend then talked directly to the parachute aircraft pilot and they sorted out a course of action.(the para man held his drop until the Kingair was clear of the ATZ). In my opinion the A/G operator SHOULD have advised my friend of the likelihood of getting 'meat bombs' descending on him but didn't.